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Poster: JustBusiness Date: Oct 8, 2009 9:16am
Forum: GratefulDead Subject: Help with .mp3 filter (reduction of pink noise).

I've downloaded a few GB of grateful dead shows (full years 1969 & 1985). There is a significant amount of pink noise (hiss), when played back. Is there software I can use to remove some of this?

If more information, or a sample is needed, I would be happy to e-mail someone a song.

Thanks.

Attachment: 18_-_Cosmic_Charlie.mp3

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Poster: RBNW....new and improved! Date: Oct 8, 2009 9:36am
Forum: GratefulDead Subject: Re: Help with .mp3 filter (reduction of pink noise).

The band is just fantastic, that is really what I think. oh by the way,
Which ones pink?

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Poster: JustBusiness Date: Oct 8, 2009 9:38am
Forum: GratefulDead Subject: Re: Help with .mp3 filter (reduction of pink noise).

The static/hiss is the pink noise.

I agree, the band is incredible. I love the evolution through the years. I was lucky enough to be at the Ratdog concert in Rochester NY this year and experienced a real live 10 minute rendition of lovelight, it was truly epic.

Any help on cleaning up the sound of the shows would be greatly appreciated!

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Poster: RBNW....new and improved! Date: Oct 8, 2009 2:58pm
Forum: GratefulDead Subject: Re: Help with .mp3 filter (reduction of pink noise).

Our downloadable (MP3) Pink noise generated from a digital source. Noise is used typically used to mask distracting sounds in a pleasing way. Many people describe white or pink noise as similar to running water, rain, or noise on a vacant TV channel. Most of the "sleep" machines on the market are based on generating variations of white or pink noise.

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Poster: Earl B. Powell Date: Oct 8, 2009 11:47am
Forum: GratefulDead Subject: Re: Help with .mp3 filter (reduction of pink noise).

Audacity is a free program that has noise reduction capabilities, but any program you use will result in the elimination of musical frequencies. Most dolby applications will also reduce noise, and since hiss is primarily what it was designed for should work for your purposes without a lot of experimentation.

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Poster: SomeDarkHollow Date: Oct 8, 2009 11:53am
Forum: GratefulDead Subject: Re: Help with .mp3 filter (reduction of pink noise).

Will Audacity allow you to boost the frequencies adjacent to the hiss? When I had a big EQ hooked up the the old stereo (another casualty of recent years), I was always able to tweak it so as to minimize hiss without losing too much high end. If Audacity has this cabaility, I will most definitely check into it.

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Poster: Earl B. Powell Date: Oct 8, 2009 11:57am
Forum: GratefulDead Subject: Re: Help with .mp3 filter (reduction of pink noise).

I haven't used it in a while and when I did it was to remove 60 cycle hum form a field recording I was working with. The results were acceptable. but as I mentioned, it still removes some frequencies.

From a practical standpoint in the analog world, jacking up frequencies, then removing noise, then normalizing with EQ would work. Audacity seems to sample all frequencies digitally and somehow detects waves that are our of place or don't represent a musical sequence. How it works????

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Poster: SomeDarkHollow Date: Oct 8, 2009 1:28pm
Forum: GratefulDead Subject: Re: Help with .mp3 filter (reduction of pink noise).

I looked at their webpage and they do have a backgroud noise cancelling feature, but it requires playing a short sample of just the noise you want removed and then the system will take that specified frequency out of the recording. Now it also has the ability to apply you own EQ settings, so that might be a possibility. I think I'll download it and play around.

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Poster: Earl B. Powell Date: Oct 8, 2009 3:40pm
Forum: GratefulDead Subject: Re: Help with .mp3 filter (reduction of pink noise).

Yup: On the recording I was removing the hum from, I found a dead space like between tracks where the hum could still be heard and used that "sample" for the noise reduction.

Once it samples the noise, you get to apply the rate of reduction or filtration. If you overdo it, the overall sound becomes way compressed. No problem though, you can re-do it again and again until you enter the save portion where it filters the whole track.

It also removes ticks, pops and scratches from digitally recorded vinyl, which is my next project.

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Poster: fireeagle Date: Oct 8, 2009 4:07pm
Forum: GratefulDead Subject: Re: Help with .mp3 filter (reduction of pink noise).

does it remove scratches and pops from already digitalized vinyl files?

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Poster: Earl B. Powell Date: Oct 8, 2009 4:55pm
Forum: GratefulDead Subject: Re: Help with .mp3 filter (reduction of pink noise).

I think that's what I was trying to get at. I've recorded an old jazz collection from vinyl to CD and from there can import into Audacity. Once imported I believe you can remove pops and scratches. Then of course you'll need to save and reburn to CD if that's the format you wish to keep.

This post was modified by Earl B. Powell on 2009-10-08 23:55:36

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Poster: Arbuthnot Date: Oct 8, 2009 4:06pm
Forum: GratefulDead Subject: Re: Help with .mp3 filter (reduction of pink noise).

if you're talking about a few GB of .mp3 files, it seems rather a waste of time tinkering with those already musically compromised files to reach your hoped-for end-result of reducing the hiss factor

at this stage of the game, data storage is so cheap it's practically free; download the lossless files and never look back

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Poster: Earl B. Powell Date: Oct 8, 2009 4:57pm
Forum: GratefulDead Subject: Re: Help with .mp3 filter (reduction of pink noise).

Remastering and doing any kind of real-time editing does seem like putting lipstick on a pig. On the other hand, it's become the format of choice for a lot of folks who have a compromised listening environment.

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Poster: Arbuthnot Date: Oct 8, 2009 5:11pm
Forum: GratefulDead Subject: Re: Help with .mp3 filter (reduction of pink noise).

agreed, agreed Earl, just baffled why anyone would tinker with .mp3 files in such a way; some 2 minutes of tuning at the end of Ramble on Rose, okay, go for it i guess

as for compromised listening environments, i assume you're referring to ipods and their kin? those folks should upgrade to something with more muscle:

http://www.jetaudio.com/products/cowon/d2plus/

caveat: i've never used either an ipod or any portable digital music device, just repeatin' what i'm readin'

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Poster: srtg83 Date: Oct 8, 2009 8:49pm
Forum: GratefulDead Subject: Re: Help with .mp3 filter (reduction of pink noise).

I am not sure how at 16gigs the COWON D2+ has more muscle. At about 2+ gigs per show with WAV files, that is less than 8 shows on the topend D2+. Sure the D2+ has some nice features but you would want to manipulate the music with an external eq. and only use these devices as "mobile file storage units" from which you extract the music. Then the 160gig ipod seems vastly superior. BTW you can also upload WAV files to the ipod if you prefer the lossless format. For selection at your fingertips at a reasonable cost, nothing beats a 160 gig ipod wired to your car stereo filled with vbr mp3s. You can only have this kind of choice with the lossless formats if you blow your brains out with an in-car computer system.